EXPERIMENTAL VERIFICATION AND COMPARISON OF MODE SHAPE-BASED DAMAGE DETECTION METHODS

摘要：

This paper presents experimental verification and comparison of damage detection methods based on changes in mode shapes such as: mode shape curvature (MSC),modal assurance criterion (MAC),strain energy (SE),modified Laplacian operator (MLO),generalized fractal dimension (GFD) and Wavelets Transform (WT).The object of the investigation is to determine benefits and drawbacks of the aforementioned methods and to develop data preprocessing algorithms for increasing damage assessment effectiveness by using signal processing techniques such as interpolation and extrapolation measured points.Noise reduction algorithms based on moving average,median filter and wavelet decomposition are also tested.The experiments were performed on a 1m long steal cantilever beam.Damage was introduced in form of 10％ and 20％ deep saw cut,placed in 10％,30％,50％,70％ and 90％ beam length.Measurements were made using non-contact Scanning Laser Doppler Vibrometer at 125 points equally spaced along beam length.

关键词： Vibration-based damage detection Scanning Laser Doppler Vibrometer cracked cantilever beam

作者: Maciej Radzienski Marek Krawczuk Wiestaw Ostachowicz

作者单位: Technical University of Gdansk,Faculty of Electrical and Control Engineering,Narutowicza 11/12,80-95 Technical University of Gdansk,Faculty of Electrical and Control Engineering,Narutowicza 11/12,80-95 Institute of Fluid Flow Machinery,Polish Academy of Sciences,ill.Fiszera 14,80-952 Gdansk,Poland

会议类型: 国际会议

会议名称: The 8th International Conference on Damage Assessment of Structures(DAMAS 2009)(第八届结构损伤评价国际学术会议)

会议地点: 北京

会议语种:英文

页码: 699-706

在线出版日期: 2009-08-03（万方平台首次上网日期，不代表论文的发表时间）